CN101087292B - Communications system, transmitter, receiver, and communications method thereof - Google Patents

Abstract

The present invention provides a transmission system, transmitter, receiver and method thereof. Sample signals P0(0) to P0 (N-1) are input for each symbol of a multiplexed transmission sample or transmission chip. The sum of a particular pair of sample signals (for example, a pair of P0 (0) and P0 (N/2)) is obtained by an adder (21) for each pair of sample signals, and a signal the power of which is halved by attenuating the sum with an attenuator is generated and output as a dispersion signal P1(N/2). Additionally, a difference between the pair of the sample signals is obtained by a subtractor (22), and a signal the power of which is halved by attenuating the difference with an attenuator (23) is generated and output as a dispersion signal P1(0). The dispersion signals Pl(0) and Pl(N/2) are made to respectively correspond to first and second subsymbols, which are configured by partitioning the symbol.

Description

Communication system, transmitter, receiver and communication means thereof

Technical field

The present invention relates to a kind of communication system etc., more specifically, relate to a kind of being used for by using frequency division multiplex communication means or code division multiplex communication means to carry out the communication system etc. of digital communication.

Background technology

In the digital communication system that communicates by use frequency division multiplex communication means or code division multiplex communication means, send peak power and become big with the ratio (PAPR) that sends average power.Under the situation of considering PAPR, transmit power amplifier is designed, cause the problem that power consumption increases and miniaturization becomes difficult.

As the routine techniques that is used to overcome this problem, exist a kind of peak value to reduce technology.

The example of this routine techniques is included in the invention of statement in patent documentation 1 and 2.

Invention according to statement in patent documentation 1, to send data in the IDFT unit modulates to generate ofdm signal in the mode of OFDM (Orthodoxy Frequency Division Multiplex), and determine whether to reduce the multi-carrier signal that generated, use and evenly to reduce circuit and reduce to be confirmed as the multi-carrier signal that need reduce equably, and use the clipping circuit crest voltage part of pruning, reduce crest voltage thus.In this way, carry out slicing and handle if the transmission peak power surpasses a threshold value, thereby reduce PAPR.

Invention according to statement in patent documentation 2, if detect the peak value that is equal to or greater than a threshold value of amplitude level, then peak value excision unit is reduced to this threshold value with detected peak value, and the switch element signal that will reduce its peak value is exported to FFT (fast Fourier transform) unit then.

(patent documentation 1) Japanese patent gazette spy opens 2002-77097 number

(patent documentation 2) Japanese patent gazette spy opens 2005-101975 number

Reduce technology according to conventional transmitted power peak value, carry out the slicing processing at sending signal.Yet, be Nonlinear Processing because slicing is handled, therefore inter symbol interference etc. can appear, and this causes the deterioration of bit error rate.

Summary of the invention

Consider the problems referred to above, an object of the present invention is to provide a kind of communication system and transmitter, receiver etc., it can reduce PAPR under the situation that does not make the bit error rate deterioration.

Communication system according to the present invention is the communication system with transmitter and receiver.Described transmitter comprises: the transmitted power peak detection unit, be used for each code element at multiplexed transmission sampling or transmission chip (chip), each transmitted power in the code element is measured, and whether measured value is detected above predetermined threshold value; With the power dispersal unit, be used for by each transmitted power in the described code element being distributed to by described code element being cut apart a plurality of sub-symbols that constitute, generate decentralized signal and with its output.Surpass described predetermined threshold value if described transmitted power peak detection unit detects the described value that measures, the described decentralized signal that then described transmitter is exported from described power dispersal unit by use is carried out the transmission to described receiver.Described receiver comprises: disperse detecting unit, be used for whether each code element at described received signal is that described decentralized signal detects to described received signal when receiving from described signal that described transmitter sends; And power combiner, be used for detecting under the situation that described received signal is described decentralized signal the power that is distributed to the described a plurality of sub-symbols in the described code element is synthesized at described dispersion detecting unit.

In above-mentioned communication system, if produced the necessity that reduces PAPR, then generate decentralized signal by each transmitted power in the code element being distributed to by described code element being cut apart a plurality of sub-symbols that constitute, and by using described decentralized signal to send to described receiver-side.At described receiver-side, if described received signal is described decentralized signal, then described power combiner returns to reset condition.In order to realize this operation, must determine whether described received signal is decentralized signal at described receiver-side.Said structure has adopted described dispersion detecting unit.Yet, can consider the various structures except that said structure.

In first structure, described transmitter also comprises: disperse the expression signal generating unit, be used for detecting measured value at described transmitted power peak detection unit and represent signal above the dispersion that the transmitted power in the described code element of generation expression under the situation of described threshold value is dispersed to described a plurality of sub-symbols; Represent the multiplexed unit of signal with disperseing, be used for described dispersion is represented that signal is multiplexed to described transmission signal.Simultaneously, described receiver also comprises: disperse the expression detecting signal unit, be used for extracting the dispersion of having represented whether to have carried out the power dispersion and represent signal, and represent that based on described dispersion signal detects the dispersion of whether having carried out transmitted power from described received signal.

In addition, above-mentioned communication system is used aforesaid multiplexed transmission sampling or is sent chip.That is, this is the communication system of the communication of a kind of communication of the OFDM of execution modulator approach or CDM (code division multiplexing) modulator approach.

Second structure is the structure under the situation of the communication system of using the OFDM modulator approach.

In the case, described transmitter also comprises the multiplexed unit of decentralized signal, and the multiplexed unit of described decentralized signal is used for by using two to disperse detection signal to add two dispersion detection subcarriers to the frequency band of protection frequency band or untapped subcarrier.Simultaneously, described receiver comprises that also dispersion detection signal detecting unit replaces described dispersion detecting unit, and described dispersion detection signal detecting unit is used for detecting the dispersion of whether having carried out transmitted power by using described a plurality of dispersion to detect subcarrier.

The 3rd structure is the structure under the situation of the communication system of using the CDM modulator approach.

In the case, described transmitter also comprises expanding element, and described expanding element is used for by using untapped extended code to disperse detection signal to carry out extension process to two.Simultaneously, described receiver comprises that also dispersion detection signal detecting unit replaces described dispersion detecting unit, and described dispersion detection signal detecting unit is used for by using described detection signal to detect the dispersion of whether having carried out transmitted power.

Description of drawings

Fig. 1 is the block diagram that illustrates according to the structure of the transmitter in first basic structure of the digital communication system of preferred embodiment;

Fig. 2 A shows the example of the structure of power dispersal unit;

Fig. 2 B shows the example of the distribute power that sends signal P0;

Fig. 2 C shows the example of the distribute power of decentralized signal P1;

Fig. 3 is the block diagram that illustrates according to the structure of the receiver in first basic structure of the digital communication system of preferred embodiment;

Fig. 4 A shows the example of the structure of received power synthesizer;

Fig. 4 B shows the example of the distribute power of received signal P2;

Fig. 4 C shows the example of the distribute power of composite signal P3;

Fig. 5 is the block diagram that illustrates according to the structure of the transmitter in second basic structure of the digital communication system of preferred embodiment;

Fig. 6 A and 6B show and are used for generating the structure of disperseing the expression signal and in the example of various types of signals of this structure;

Fig. 6 C and 6D show the example of disperseing the expression signal;

Fig. 7 is the block diagram that illustrates according to the structure of the receiver in second basic structure of the digital communication system of preferred embodiment;

Fig. 8 A and 8B show and disperse to represent the structure of detecting signal unit and the example of the various types of signals in this structure;

Fig. 8 C and 8D show the example that signal is represented in detected dispersion;

Fig. 9 has been an illustration block diagram of the transmitter when present technique is applied to the OFDM modulator approach (numbering 1);

Figure 10 has been an illustration block diagram of the transmitter when present technique is applied to the OFDM modulator approach (numbering 2);

Figure 11 has been the illustration block diagram of the receiver when present technique is applied to the OFDM modulator approach;

The block diagram of the structure of the dispersion detecting unit in Figure 12 A has been the illustration receiver shown in Figure 11;

Figure 12 B shows when carrying out/reception when not disperseing and the example of composite signal to 12E;

Figure 13 has been the illustration block diagram of the transmitter when present technique is applied to the CDM modulator approach;

Figure 14 has been the illustration block diagram of the receiver when present technique is applied to the CDM modulator approach;

The block diagram of the structure of the dispersion detecting unit in Figure 15 A has been the illustration receiver shown in Figure 14;

Figure 15 B is when carrying out/reception when not disperseing and the schematic diagram of composite signal to 15E;

The block diagram of the structure of the transmitter in Figure 16 has been an illustration another preferred embodiment of OFDM modulator approach;

The schematic diagram of the transmission frequency spectrum in Figure 17 has been an illustration described another preferred embodiment among Figure 16;

Figure 18 is the block diagram that illustrates with the structure of the corresponding receiver of transmitter shown in Figure 16;

Figure 19 A shows the example of the dispersion detecting unit of receiver shown in Figure 180;

Figure 19 B and 19C show when carrying out/example of received signal when not disperseing;

The block diagram of the structure of the transmitter in Figure 20 has been an illustration another preferred embodiment of CDM modulator approach;

Figure 21 is the block diagram that illustrates with the structure of the corresponding receiver of transmitter shown in Figure 20;

Figure 22 A shows the example of the structure of the dispersion detection signal detecting unit in the receiver shown in Figure 21;

Figure 22 B and 22C show when carrying out/example of received signal when not disperseing;

Figure 23 A and 23B illustrate to be used for generating the structure of disperseing the expression signal and at the schematic diagram of another example of various types of signals of this structure;

Figure 23 C and 23D show the example of disperseing the expression signal; And

Figure 24 A shows with the corresponding dispersion of structure shown in Figure 23 A to 24D and represents the structure of detecting signal unit and the example of the various types of signals in this structure.

Embodiment

Following with reference to accompanying drawing to being described according to a preferred embodiment of the invention.

Fig. 1 and 3 is the block diagrams that illustrate according to first basic structure of the digital communication system of preferred embodiment.Fig. 1 and 3 shows the structure of transmitter and receiver respectively.Yet, only show new structure division, and wherein omitted the conventional structure of transmitter and receiver according to transmitter of the present invention and receiver.On this meaning, the structure shown in Fig. 1 and 3 can be called peak power dispersal unit 10 that is arranged in the transmitter and the anti-dispersal unit 30 of peak power that is arranged in the receiver, although in the following description they are called transmitter 10 and receiver 30.

Transmitter 10 shown in Figure 1 comprises string and converting unit 11, power dispersal unit 12, transmitted power peak detection unit 13, selected cell 14, parallel serial conversion unit 15 and all kinds timing signal generating unit 16.

To string and the multiplexed transmission data of converting unit 11 inputs (multiplexed transmission sampling (under the situation at OFDM) or multiplexed transmission chip (under the situation at CDMA)), string and converting unit 11 are a plurality of parallel signals of unit with Cheng Yiyi code element of this data transaction.Below in these parallel signals each is called sampled signal.

Transmitted power peak detection unit 13 is measured each the transmitted power in these sampled signals, whether detects that the transmitted power of at least one sampled signal has surpassed predetermined threshold value, and to selected cell 14 output detection signals.This threshold value at random can be set at suitable value.Preferably, this threshold value for example is set at " average power that code element is interior " or " than deducting the big value (naturally, it is the value littler than this gross power) of value that arbitrary value S (S is the value that is equal to or less than 3 (dB)) obtains " by the gross power in a code element.From another viewpoint, preferably, the quantity that this threshold setting is become to make its transmitted power surpass the sampled signal of this threshold value does not become 2 or bigger.

Power dispersal unit 12 is distributed to a plurality of sub-symbols with the transmitted power in the code element.More particularly, by being cut apart, an above-mentioned code element generates sub-symbols.In this explanation, a code element is divided into two sub-symbols.Yet the quantity of sub-symbols is not limited to two.Owing in this explanation, a code element is divided into two, has therefore generated two sub-symbols.Power dispersal unit 12 is distributed to two sub-symbols with the transmitted power of each sampled signal in the above-mentioned code element.Fig. 2 A shows the details of the structure of power dispersal unit 12, will be described this after a while.

The output of string and converting unit 11 and the output of power dispersal unit 12 are inputed to selected cell 14.Selected cell 14 is according to the output signal of selecting and export string and converting unit 11 and power dispersal unit 12 from the detection signal of transmitted power peak detection unit 13 outputs any.

Parallel serial conversion unit 15 converts the output signal of selected cell 14 to serial signal.

To all kinds timing signal generating unit 16 input symbols timing signals, all kinds timing signal generating unit 16 generates and exports various types of timing signals, and these timing signals are determined the operation timing of above-mentioned component part 11 to 13 and 15 based on the symbol timing signal.In addition, all kinds timing signal generating unit 16 will be exported to string and converting unit 11, power dispersal unit 12, transmitted power peak detection unit 13 and parallel serial conversion unit 15 based on various types of timing signals that the symbol timing signal generates.

To send to receiver from the serial signal of parallel serial conversion unit 15 outputs by unshowned transmitting element.

Fig. 2 A shows the example of the structure of power dispersal unit 12.

Power dispersal unit 12 shown in this figure comprises: a plurality of adders 21 are used to export a plurality of sampled signal sums; A plurality of subtracters 22 are used to export the poor of a plurality of sampled signals; And a plurality of attenuators 23, be used for making each the power attenuation of output signal of described a plurality of adder 21 and described a plurality of subtracter 22.

Here, as described above the transmitted power in a plurality of sampling units is distributed to two sub-symbols.In addition, the hypothesis of the example shown in Fig. 2 A exists N sampled signal P0 (0) to P0 (N-1).In the case, be provided with N/2 adder 21 and N/2 subtracter 22.Here, suppose that described a plurality of attenuator 23 is half with each the power attenuation of output signal in each and the described a plurality of subtracters 22 in described a plurality of adders 21.

At per two convenience sampling signals to carrying out addition that is undertaken by adder 21 and the subtraction that is undertaken by subtracter 22.Then, by attenuator 23 result of this addition and subtraction is decayed to half.

Described two sampled signals to can being arbitrarily.Yet it is better avoiding the pairing of the sampled signal in the same sub-symbols.In the example shown in Fig. 2 A, right as two above-mentioned sampled signals makes sampled signal P0 (N/2+n) corresponding to sampled signal P0 (n) (n: integer).Therefore, for example, respectively, sampled signal P0 (0) and P0 (N/2) pairing, and sampled signal P0 (1) and P0 (N/2+1) pairing.

Adopt sampled signal P0 (0) and P0 (N/2) to as example, obtain the poor of these two sampled signals by subtracter 22, and will this difference be decayed into half signal that obtains by use attenuator 23 and export as decentralized signal P1 (0).In addition, obtain sampled signal P0 (0) and P0 (N/2) sums by adder 21, and will be by using attenuator 23 to be somebody's turn to do and decaying into half signal that obtains and export as decentralized signal P1 (N/2).Decentralized signal P1 (0) and P1 (N/2) correspond respectively to first sub-symbols and second sub-symbols.This processing is called " (sampled signal) each transmitted power in the code element is dispersed into a plurality of sub-symbols " or " generation decentralized signal ".

Similarly, right for sampled signal P0 (1) and P0 (N/2+1) obtains the poor of these two sampled signals by subtracter 22, and will export as decentralized signal P1 (1) by using attenuator 23 that this difference will be decayed into half signal that obtains.In addition, obtain sampled signal P0 (1) and P0 (N/2+1) sums by adder 21, and will be by using attenuator 23 to be somebody's turn to do and decaying into half signal that obtains and export as decentralized signal P1 (N/2+1).

At all sampled signals to carrying out above-mentioned processing, thereby the transmitted power in the code element can be dispersed into two sub-symbols.

Can represent foregoing description by following formula (1):

P0: the power of input sampling

P1: the power of output sampling

$P1\left(n\right)=\frac{P0\left(n\right)-P0(N/2+n)}{2},(n<N/2)$

$P1\left(n\right)=\frac{P0\left(n\right)+P0(N/2+n)}{2},(n\&GreaterEqual;N/2)---\left(1\right)$

Fig. 2 B shows an example of the distribute power of a code element that sends signal.Because the figure shows and sending signal is the situation of serial signal, so transverse axis express time t.Also of this sort in Fig. 2 C.

Example among Fig. 2 B shows the situation of the peak value of emergent power in sampled signal P0 (1).

In the case, based on the above formula that provides (1) power of sampled signal P0 (1) is distributed to two sub-symbols.Shown in Fig. 2 C, the power of sampled signal P0 (1) is distributed to decentralized signal P1 (1) and P1 (N/2+1).Then, the decentralized signal P1 that will have the distribute power shown in Fig. 2 C exports to selected cell 14.

The peak power of supposing the sampled signal P0 shown in Fig. 2 B (1) surpasses above-mentioned threshold value, and then transmitted power peak detection unit 13 detects peak power and surpassed threshold value, and this testing result is exported to selected cell 14.As a result, selected cell 14 is selected the output (decentralized signal P1) of power dispersal unit 12, and selected signal is exported to parallel serial conversion unit 15.In the case, parallel serial conversion unit 15 converts this decentralized signal to serial signal, and exports this serial signal.

As mentioned above, the peak power that sends signal can be distributed to a plurality of sub-symbols and send.

Fig. 3 shows the block diagram of the structure of aforesaid receiver.

Receiver 30 shown in this figure comprises string and converting unit 31, symbol timing detecting unit 32, all kinds timing signal generating unit 33, power combiner 34, disperses detecting unit 35, selected cell 36 and parallel serial conversion unit 37.

When receiving the transmission signal from transmitter 10, string and converting unit 31 convert this received signal (be called as acceptance sampling or receive chip) to a plurality of parallel signals at each code element.The output of string and converting unit 31 is inputed to power combiner 34, disperses detecting unit 35 and selected cell 36.Below in these parallel signals each all is called the acceptance sampling signal.

Symbol timing detecting unit 32 extracts the symbol timing signal from received signal, and the signal that is extracted is exported to all kinds timing signal generating unit 33.The operation of all kinds timing signal generating unit 16 of the operation of all kinds timing signal generating unit 33 and transmitter 10 is similar substantially.Promptly, all kinds timing signal generating unit 33 generates the synchronous various types of timing signals of operation that are used to make a plurality of functional units in the receiver 30 based on the symbol timing signal, and the signal that is generated is exported to these functional units (string and converting unit 31, power combiner 34, dispersion detecting unit 35 and parallel serial conversion unit 37).

With received signal whether be distributed to a plurality of sub-symbols signal irrespectively, power combiner 34 is carried out and is used for processing that a plurality of sampled signals are synthesized, and will export to selected cell 36 and disperse detecting unit 35 according to the composite signal that this processing obtains.

To the output signal (received signal) of detecting unit 35 input strings and converting unit 31 and the output signal (composite signal) of power combiner 34, disperse whether detecting unit 35 is that decentralized signal detects to received signal, and to selected cell 36 output detection signals.

Selected cell 36 is according in the output signal (composite signal) of selecting and export the output signal (received signal) of string and converting unit 31 and power combiner 34 from the detection signal that disperses detecting unit 35 any.Received signal is the signal of decentralized signal if detection signal is expression, and then selected cell 36 is selected the also output signal (composite signal) of power output synthesizer 34 naturally.

Parallel serial conversion unit 37 converts the output signal of selected cell 36 to serial signal.

Fig. 4 A shows the example of the structure of power combiner 34.

Power combiner 34 shown in this figure comprises a plurality of adders 41 that are used to obtain a plurality of acceptance sampling signal sums and is used to obtain a plurality of subtracters 42 of the difference of a plurality of acceptance sampling signals.Here, show the example of this structure according to the said structure example of transmitter 10 sides shown in Fig. 2 A.Therefore, suppose to exist N acceptance sampling signal P2 (0) shown in Fig. 4 A to arrive P2 (N-1) (signal P2 corresponding among signal P0 and the P1 any).In addition, be provided with N/2 adder 41 and N/2 subtracter 42.

By with the similar mode of above-mentioned situation of Fig. 2 A, at per two acceptance sampling signals to carrying out addition that is undertaken by adder 41 and the subtraction that is undertaken by subtracter 42, and the output of output adder 41 and subtracter 42 is as composite signal.Acceptance sampling signal P2 (0) arrives in P1 (N-1) any corresponding to sampled signal P0 (0) to P0 (N-1) and decentralized signal P1 (0) to P2 (N-1).That is, if carried out dispersion treatment in sender side, then acceptance sampling signal P2 (0) arrives P1 (N-1) to P2 (N-1) corresponding to decentralized signal P1 (0).

In Fig. 4 A example shown, right as two above-mentioned sampled signals, make acceptance sampling signal P2 (N/2+n) corresponding to acceptance sampling signal P2 (n) (n: integer).Therefore, for example, respectively, acceptance sampling signal P2 (0) and P2 (N/2) pairing, and acceptance sampling signal P2 (1) and P2 (N/2+1) pairing.

Adopt acceptance sampling signal P2 (0) and P2 (N/2) to as example, poor by subtracter 42 these two acceptance sampling signals of acquisition, and export this difference as composite signal P3 (0).In addition, obtain these two acceptance sampling signal sums by adder 41, and output should and as composite signal P3 (N/2).

Similarly, right for acceptance sampling signal P2 (1) and P2 (N/2+1) obtains the poor of these two acceptance sampling signals by subtracter 42, and exports this difference as composite signal P3 (1).In addition, obtain these two acceptance sampling signal sums by adder 41, and output should and as composite signal P3 (N/2+1).

At all acceptance sampling signals to carrying out above-mentioned processing, thereby can the received power of two sub-symbols is synthetic.

Can represent foregoing description by following formula (2):

P2: the power that receives the input sampling

P3: the power that receives synthetic sampling

P3(n)＝P2(n)+P2(N/2+n)(n＜N/2)

(2)

P3(n)＝-P2(n)+P2(N/2+n)(n＜N/2)

For example, if receive the signal shown in Fig. 2 C, then this received signal is to have the signal (shown in Fig. 4 B) that the peak power that occurs in sampled signal P0 (1) is dispersed to the distribute power of decentralized signal P1 (1) and P1 (N/2).Carry out synthetic processing at this received signal, thus the distribute power of composite signal P3 is reverted to the reset condition shown in Fig. 4 C by the above formula that provides (2) expression.

Fig. 5 and 7 shows the block diagram according to second basic structure of the digital communication system of preferred embodiment.Fig. 5 and 7 shows the structure of transmitter and receiver respectively.Here, must whether be that decentralized signal detects to received signal at receiver-side as described above.Being used for whether having carried out the method for disperseing to detect is different for first basic structure with second basic structure.On the contrary, can be identical for other structures.Therefore, use identical label to represent and the identical part of those parts shown in Fig. 1 and 3 at Fig. 5 in 7, and omit description of them.After a while being used in first basic structure is described whether having carried out the method for disperseing to detect.

As shown in Figure 5, except that the structure of transmitter shown in Figure 1 10, transmitter 50 also comprises and disperses the multiplexed unit 51 of expression signal and disperse expression signal generating unit 52.

To disperse expression signal generating unit 52 from the input of the timing signal a various types of timing signals of all kinds timing signal generating unit 16 outputs.This timing signal a is based on above-mentioned symbol timing signal generation.In addition, will disperse expression signal generating unit 52 from the detection signal b input of transmitted power peak detection unit 13 outputs.Generate and export dispersion expression signal based on input signal a and b.This dispersion expression signal is that expression sends whether signal is the signal of decentralized signal P1.

Disperse the multiplexed unit 51 of expression signal will disperse the expression signal to be multiplexed into the output signal of parallel serial conversion unit 15.

Fig. 6 A shows the block diagram of the structure of disperseing expression signal generating unit 52.

This is wherein to disperse the expression signal to be generated as the example of bpsk signal.

Dispersion shown in Fig. 6 A represents that signal generating unit 52 comprises oscillator 61, NOT circuit 62, switch 63 and 64 and on/off signal generating unit 65.

The signal that oscillator 61 outputs have preset frequency.Generate and export its cycle in this example and be half signal of Baud Length.

Determine the timing of each code element based on timing signal a.Shown in Fig. 6 B, the trailing edge of timing signal a edge is the beginning of each code element.Generate timing signal a based on the symbol timing signal as described above.Shown in Fig. 6 B, this is a kind of like this signal: its value becomes " 0 " (low level) in the first half of each code element, and becomes " 1 " (high level) in half thereafter.

Here, for each code element, if any one in a plurality of sampling or more a plurality of transmitted powers surpass threshold value, then detection signal b becomes " 1 ".

Fig. 6 B shows two any code elements (first and second code elements).At first code element, detection signal b is " 0 ", and at second code element, detection signal b is " 1 ".

To on/off signal generating unit 65 incoming timing signal a and detection signal b, on/off signal generating unit 65 generates and exports the on signal that is used for switch 64 according to signal a that is imported and b.Shown in Fig. 6 B, when being " 0 ", exports detection signal b connection signal all the time, when detection signal b is " 1 " and the timing signal a time output cut-off signal that is " 0 ", when detection signal b be " 1 " and timing signal a output connection signal when being " 1 " (, the output timing signal is a).

Moreover detection signal b serves as the switching signal of switch 63.Switch 63 is selected the A side when detection signal b is " 0 ", perhaps selects the B side when detection signal b is " 1 ".When switch 63 is selected the A side, select and export the output signal of oscillator 61.Perhaps, when switch 63 is selected the B side, the output (inverted signal of the output signal of oscillator 61) of selecting and exporting NOT circuit 62.In addition, the output with switch 63 inputs to switch 64.

Based on above description, shown in Fig. 6 C, the dispersion of first code element represents that signal becomes the output signal of oscillator 61.Simultaneously, shown in Fig. 6 D, the dispersion of second code element represents that signal becomes and do not have signal owing to broken switch 64 in first sub-symbols, and becomes the inverted signal of the output signal of oscillator 61 in second sub-symbols.

Generate above-mentioned dispersion and represent signal, can send signal and can be by disperseing the multiplexed unit 51 of expression signal that this signal is multiplexed to thus at the signal that sends under the situation that does not produce interference after multiplexed.

Next receiver shown in Figure 7 70 is described.

As shown in the drawing, the structure of the structure of receiver 70 and receiver shown in Figure 3 30 is basic identical.Yet the difference of existence is: be provided with and disperse expression detecting signal unit 71 to replace dispersion detecting unit 35 shown in Figure 3.

Detecting unit 35 is similar with disperseing, to the received signal and the symbol timing signal that disperse 71 inputs of expression detecting signal unit from 33 outputs of all kinds timing signal generating unit, disperse expression detecting signal unit 71 whether to carry out the detection signal that disperses to selected cell 36 output expressions.

Fig. 8 A shows the block diagram of the structure of disperseing expression detecting signal unit 71.

Dispersion shown in this figure represents that detecting signal unit 71 comprises timing signal generating unit 81, switch 82, disperses expression signal extraction unit 83, quadrature demodulation unit 84 and discriminator 85.

Timing signal generating unit 81 generates timing signal c based on the symbol timing signal of being imported.Shown in Fig. 8 B, timing signal c is identical with above-mentioned timing signal a.This signal becomes " 0 " in the first half of each code element, and becomes " 1 " in half thereafter.According to timing signal c the on/off of switch 82 is controlled.Cut-off switch 82 when timing signal c is " 0 ", connect switch 82 when timing signal c is " 1 ".Therefore, first half (the being equal to first sub-symbols) input with each code element does not disperse expression signal extraction unit 83, and only imports latter half (being equal to second sub-symbols).

Therefore, disperse expression signal extraction unit 83 (it is intended to extract dispersion expression signal from received signal) only to extract the part that is equal to second sub-symbols of disperseing to represent signal, as Fig. 8 C and Fig. 8 D at each code element.Specifically, disperseing expression signal extraction unit 83 is band pass filters etc., and it passes through the characteristic frequency district.Naturally, the output signal frequency component of oscillator 61 is passed through.

The dispersion of being extracted is represented that signal inputs to quadrature demodulation unit 84 (it carries out demodulation to this signal).Whether the polarity by 85 pairs of restituted signals of discriminator is differentiated to having carried out in each code element of received signal disperse to detect thus.

The schematic diagram of the structure of Fig. 9 is the illustration transmitter when the digital communication system that will have above-mentioned first basic structure is applied to the OFDM modulator approach.

Transmitter 90 shown in this figure comprises string and converting unit 91, transmitted power dispersal unit 92, transmitted power peak detection unit 93, selected cell 94, parallel serial conversion unit 95, all kinds timing signal generating unit 96, string and converting unit 301, mapping circuit 302, IFFT unit 303 and P/S (and string conversion) unit 304.

Because string and converting unit 301, mapping circuit 302, IFFT unit 303 and P/S (and string conversion) unit 304 is the conventional component parts that adopt in the existing transmitter of OFDM method, and therefore description of them is not provided particularly.By these component parts 301 to 304, generate above-mentioned multiplexed transmission sampling.That is, component part 301 to 304 generates and exports so-called ofdm signal and (it carried out serial signal such as the conventional OFDM modulation treatment that mapping is handled, IFFT handles etc.This signal is made of a plurality of digital modulation signals with different carrier frequencies, and has orthogonality relation among these carrier waves).This ofdm signal is equal to the multiplexed transmission sampling shown in Fig. 1 etc.

With string and converting unit 91, transmitted power dispersal unit 92, transmitted power peak detection unit 93, selected cell 94, parallel serial conversion unit 95 and all kinds timing signal generating unit 96 is configured to carry out and go here and there and those functions of converting unit 11, transmitted power dispersal unit 12, transmitted power peak detection unit 13, selected cell 14, parallel serial conversion unit 15 and all kinds timing signal generating unit 16 similar function almost.Below their function is briefly described.

String and converting unit 91 are converted from serial to ofdm signal parallel at each code element (OFDM code element).

To the output of transmitted power dispersal unit 92 input strings and converting unit 91, transmitted power dispersal unit 92 is distributed to a plurality of sub-symbols with the transmitted power of a code element.The peak power of 93 pairs of OFDM code elements of transmitted power peak detection unit detects, and determines whether peak power surpasses predetermined threshold value, and will determine that the result exports to selected cell 94 as selecting signal.Selected cell 94 according to this select signal select and the output signal of the output signal of output string and converting unit 91 and transmitted power dispersal unit 92 in any.Parallel serial conversion unit 95 converts the output signal of selected cell 94 to serial signal.

As mentioned above,, then transmitted power is distributed to a plurality of sub-symbols and sends, can reduce PAPR thus if detect the transmission peak power that has surpassed threshold value.

Yet, in structure shown in Figure 9, after converting the output signal (parallel signal) of IFFT unit 303 to serial signal, only immediately it is reverted to parallel signal by string and converting unit 91 by P/S unit 304.Therefore, we can say that P/S unit 304 and string and converting unit 91 are unnecessary.Therefore, can remove P/S unit 304 and string and converting unit 91 in structure shown in Figure 9, and can use the output signal of IFFT unit 303 to substitute the also output signal of converting unit 91 of string.That is, can adopt structure shown in Figure 10 to substitute structure shown in Figure 9.

In Figure 10, use identical label to represent the component part identical with those component parts shown in Figure 9.As shown in figure 10, transmitter comprises string and converting unit 301, mapping circuit 302 and IFFT unit 303, removed P/S unit 304 and string and converting unit 91, and the output signal of IFFT unit 303 has been inputed to transmitted power dispersal unit 92, transmitted power peak detection unit 93 and selected cell 94 as sampled signal.

As the example of the structure that is used for the OFDM method, for the similar reason of the reason of Figure 10, from this structure, remove with unnecessary string and conversion and and string change relevant component part.In addition, omit existing component part in some cases.For example, in Figure 11, FFT unit 311 and parallel serial conversion unit 312 are the conventional component parts in the existing receiver that uses the OFDM method, and omit existing reflection and penetrate processing unit etc.

Figure 11 is the block diagram that the structure of receiver 100 is shown, and this receiver 100 receives from transmitter shown in Figure 9 90 and sends signal.

Receiver 100 shown in this figure comprises string and converting unit 101, symbol timing detecting unit 102, all kinds timing signal generating unit 103, power combiner 104, disperses detecting unit 105, selected cell 106, FFT unit 311 and parallel serial conversion unit 312.

With string and converting unit 101, symbol timing detecting unit 102, all kinds timing signal generating unit 103, power combiner 104, disperse detecting unit 105 and selected cell 106 to be configured to carry out and the basic similarly function of those functions of corresponding component part shown in Figure 3 31 to 36, therefore description of them specifically is not provided.

In addition, because FFT unit 311 and parallel serial conversion unit 312 are aforesaid existing component parts, therefore specifically do not provide description of them.

Figure 12 A shows the example of the structure of disperseing detecting unit 105.

Dispersion detecting unit 105 shown in this figure comprises DFT unit 111,112,113 and 114, correlator 115 and 116 and comparing unit 117.The received signal (1) that each input in DFT unit 111,112,113 and 114 is shown in Figure 11 and any in the composite signal (2), DFT unit 111,112,113 and 114 respectively under predetermined condition by being that to carry out that DFT (discrete Fourier transform (DFT)) handles (be target with among f0 and the f2 any one to target in the example depicted in fig. 12 with in the even number subcarrier any one, pre-determine a target sub-carriers, and all DFT unit 111,112,113 and 114 are target with same subcarrier all).That is, DFT unit 111,112,113 and 114 basic function are to carry out general DFT to handle (being used for extracting by discrete Fourier transform (DFT) the processing of specific frequency components), but will emphasize following condition:

(a) above-mentioned specific frequency components is defined as in the even number subcarrier any one.

(b) always not carrying out DFT at a code element handles.That is, this processing is carried out at a code element in DFT unit 112 and 113.Yet this processing is carried out at a code element back half (second sub-symbols time T 2) in DFT unit 111, and this processing is carried out at the first half (the first sub-symbols time T 1) of a code element in DFT unit 114.

In fact, received signal (1) and composite signal (2) they are parallel signals, and each signal of expression parallel signals such as the T shown in Figure 12 A (0), T (N/2), T (N-1) (expression acceptance sampling signal, but be called sampling here).Parallel signal such as received signal (1) and composite signal (2) is made of to T (N-1) N sampling T (0) respectively.Therefore, all sampling T (0) are imported DFT unit 112 and 113 to T (N-1), DFT unit 112 and 113 is carried out DTF and handle (" carrying out DFT in OFDM symbol time N handles " is provided) in the description that provides after a while then.Simultaneously, the T (N/2) that only will sample inputs to DFT unit 111 to T (N-1), and the DFT processing is carried out in DFT unit 111 then.Because therefore N=8 only imports sampling T (4) and handles (" carrying out the DFT processing in the second sub-symbols time T 2 " is provided) to carry out DFT to T (7) in the description that provides after a while in this example.Similarly, in this example, the T (0) that only will sample inputs to DFT unit 114 to T (3), and DFT unit 114 is carried out DFT and handle (" carrying out DFT in the first sub-symbols time T 1 handles " is provided) in the description that provides after a while then.

Notice that " even number subcarrier " is the statement under the situation of the first subcarrier f0 being treated as the 0th subcarrier (its quilt is as the even number subcarrier).If the first subcarrier f0 as the 1st subcarrier, be we can say in the odd number subcarrier any one as processing target.

Therefore, if use another definition mode, we can say that then above-mentioned f0, f2 etc. are " signals of pressing the cycle repetition of N/2 under regular situation ".Because these signals are " signals of pressing the cycle repetition of N/2 under regular situation ", so the waveform of first and second sub-symbols of sort signal becomes identical.In addition, " under regular situation " is meant the situation of the received signal in not using prior art constructions of the present invention.In other words, this is meant " received signal (1) when not carrying out dispersion ".Figure 12 B shows " received signal (1) when not carrying out dispersion ".As obvious from Figure 12 B, the waveform of first and second sub-symbols is identical in f0 and f2.Simultaneously, the waveform difference of first and second sub-symbols in f1.

Based on above description, subcarrier that in the following description will " by the signal of cycle of N/2 repetition " is called " even number subcarrier ".

At first, to the output (hereinafter referred to as received signal (1)) of DFT unit 111 input strings and converting unit 101, DFT unit 111 is carried out DFT (discrete Fourier transform (DFT)) at the specific even number subcarrier of received signal (1) and is handled in the second sub-symbols time T 2.

To DFT unit 113 input received signals (1), DFT unit 113 is carried out DFT at specific even number subcarrier and is handled in OFDM symbol time N.

To the output signal (hereinafter referred to as composite signal (2)) of DFT unit 112 input power synthesizers 104, DFT unit 112 is carried out DFT at the specific even number subcarrier of composite signal (2) and is handled in OFDM symbol time N.

To DFT unit 114 input composite signals (2), DFT unit 114 is carried out DFT at the specific even number subcarrier of composite signal (2) and is handled in the first sub-symbols time T 1.

Correlation between 115 pairs of DFT unit 111 of correlator and 112 the output detects.

Correlation between 116 pairs of DFT unit 113 of correlator and 114 the output detects.

Comparing unit 117 compares between respectively by correlator 115 and 116 detected correlations.If the correlation of correlator 115 is bigger, then comparing unit 117 has been carried out the signal that disperses to selected cell 106 output expressions, perhaps, if the correlation of correlator 116 is bigger, then comparing unit 117 is not carried out the signal that disperses to selected cell 106 output expressions.

As mentioned above, Figure 12 B shows the example when the received signal when sender side is not carried out dispersion treatment (1).Here, for the purpose of explanation, (1) is cut apart and is represented by a plurality of subcarrier components to received signal.In fact, received signal (1) is in these subcarrier components naturally by multiplexed state.Also of this sort in to 12E and Figure 15 B to 15E at Figure 12 C that will describe after a while.

In the example shown in the 12E, signal f0 is the signal of frequency 0 at Figure 12 B, and signal f1 is the signal with fundamental frequency of cycle 1/f1=Baud Length, and signal f2 is that frequency is the double fundamental frequency (signal of f2=2 * f1).On this meaning, also pending " even number subcarrier " can be called " the subcarrier of frequency " with even-multiple (also comprising 0) of fundamental frequency.

For figure is simplified, only show 3 channel f0 to f2.Yet much less, (naturally, their frequency is the integral multiple (n * f1 of fundamental frequency can other subcarriers; N=3,4,5 ...)).Signal f0, f2 etc. are the even number subcarriers, and signal f1 etc. are the odd number subcarriers.

As mentioned above, Figure 12 B shows conventional OFDM received signal (1).

In the case, if be that target is carried out DFT and handled in DFT unit 113 in OFDM symbol time N with one in the even number subcarrier, then disturbing between subcarrier can not appear in (much less).Simultaneously, handle, then applied between subcarrier and disturbed if in DFT unit 111, in the second sub-symbols time T 2, carry out DFT.In the example shown in Figure 12 B, if do not occur disturbing between subcarrier, then DFT unit 111,112,113 and 114 outputs " 1 " are disturbed if applied between subcarrier, then the value of output except that " 1 ".

Figure 12 C shows the composite signal (2) that is generated based on received signal (1) by power combiner 104 when when sender side is not carried out dispersion treatment.

In the case, if be that target is carried out DFT and handled in DFT unit 114 in the first sub-symbols time T 1, then can not occur disturbing between subcarrier with one in the even number subcarrier.

Simultaneously, if be that target is carried out DFT and handled in DFT unit 112 in OFDM symbol time N, then applied between subcarrier and disturbed with one in the even number subcarrier.

As mentioned above, if do not carry out dispersion treatment, then can not apply between subcarrier and disturb, thereby become 1 by correlator 116 detected correlations to the result who handles by DFT unit 113 and 114 DFT that carry out in sender side.Simultaneously, the result that the DFT that carried out by DFT unit 111 and 112 are handled has applied between subcarrier and has disturbed, thereby can not become 1 (correlation＜1) by correlator 115 detected correlations.

Therefore, as mentioned above, do not carry out the signal that disperses from comparing unit 117 output expressions.

Notice that correlator 115 is identical with the function of the correlator 165 that will describe after a while and 166 with 116 function.

Figure 12 D shows the example when the subcarrier signals of the received signal (1) when sender side is carried out dispersion treatment.As shown in the drawing, the even number subcarrier is in the state that does not have signal in first sub-symbols, and the odd number subcarrier is in the state that does not have signal in second sub-symbols.In addition, shown in Figure 12 E, the composite signal (2) that is generated based on received signal (1) by power combiner 104 when carrying out dispersion treatment in sender side becomes identical with the composite signal shown in Figure 12 B (naturally, this is because this signal is reverted to reset condition).

Therefore, if carry out dispersion treatment, then can not apply between subcarrier and disturb, thereby become 1 by correlator 115 detected correlations to the result who handles by DFT unit 111 and 112 DFT that carry out in sender side.Simultaneously, the result that the DFT that carried out by DFT unit 113 and 114 are handled applies between subcarrier and disturbs, thereby can not become 1 (correlation＜1) by correlator 116 detected correlations.

Therefore, as mentioned above, carried out the signal that disperses from comparing unit 117 output expressions.

By circuit shown in Figure 2, the signal shown in Figure 12 B becomes those signals shown in Figure 12 D.For example, if by adopt P0 (1) shown in Figure 2 and P0 (N/2+1) to as example, at the result of each subcarrier components (supposition P0 (1) and P0 (N/2+1) are equal to T (1) and T (5)) consideration by the addition of adder 21 execution, then the result of subcarrier f0 and f2 is positive, but the result of subcarrier f1 is positive with negative (their absolute value is identical).Therefore, shown in Figure 12 D, as the result of addition, the signal T (5) of subcarrier f1 becomes 0.

Figure 13 shows the example of the structure of the transmitter when the digital communication system that will have first basic structure is applied to the CDM modulator approach.

Transmitter 120 shown in this figure comprises string and converting unit 121, transmitted power dispersal unit 122, transmitted power peak detection unit 123, selected cell 124, parallel serial conversion unit 125, all kinds timing signal generating unit 126, extended code generation unit 127, expander 128, synthesizer 129 and string and converting unit 130.

String and converting unit 121, transmitted power dispersal unit 122, transmitted power peak detection unit 123, selected cell 124, parallel serial conversion unit 125 and all kinds timing signal generating unit 126 be configured to carry out and those functions of above-mentioned string and converting unit 11, power dispersal unit 12, transmitted power peak detection unit 13, selected cell 14, parallel serial conversion unit 15 and all kinds timing signal generating unit 16 similar function almost, below do not provide description of them particularly.

In addition, extended code generation unit 127, expander 128, synthesizer 129 and string and converting unit 130 only are the conventional component parts of CDMA transmitter.Therefore, below they are briefly described.

String and converting unit 130 will send data transaction and become parallel signal, and these parallel signals are exported to corresponding expander 128.These corresponding expanders 128 are carried out extension process by using in a plurality of extended codes (orthogonal code) that generated by extended code generation unit 127 any one to the output signal from string and converting unit 130.Synthesizer 129 synthesizes the output of these expanders 128.To the output (multiplexed transmission chip) of string and converting unit 121 input synthesizers 129, string and converting unit 121 should send chip transition at each code element and become parallel signal.

Figure 14 illustrates the block diagram that receives the structure of the receiver that sends signal from transmitter shown in Figure 13 120.

Receiver 140 shown in this figure comprises string and converting unit 141, symbol timing detecting unit 142, all kinds timing signal generating unit 143, power combiner 144, disperses detecting unit 145, selected cell 146 and parallel serial conversion unit 147.These component parts are configured to carry out and the almost similar function of those functions of corresponding component part shown in Figure 3 31 to 37, therefore description of them specifically is not provided.

Receiver 140 shown in this figure also comprises parallel serial conversion unit 148, a plurality of correlator 149 and extended code generation unit 150.These component parts only are the conventional component parts of CDMA receiver.Therefore, below they are briefly described.

The output of parallel serial conversion unit 147 is inputed in described a plurality of correlator 149 each.Extended code generation unit 150 generates the copy of extended code.In described a plurality of correlator 149 each is handled by using in a plurality of extended codes that generated by extended code generation unit 150 any one to carry out despreading, so that the degree of correlation is detected.Parallel serial conversion unit 148 converts the output signal of described a plurality of correlators 149 to serial signal.

Figure 15 A shows the details of the structure of dispersion detecting unit 145 shown in Figure 14 to 15E.

Dispersion detecting unit 145 shown in this figure comprises correlator 161,162,163,164,165 and 166 and comparing unit 167.

Output signal (hereinafter referred to as received signal (3)) to correlator 161 and 163 input strings and converting unit 141.Output signal (hereinafter referred to as composite signal (4)) to correlator 162 and 164 input power synthesizers 144.

Those function classes of a plurality of correlators (correlator 149) that correlator 161,162,163 and 164 function and receiver-side in cdma communication use seemingly.Yet, be with the difference of described a plurality of correlators 149: correlator 161 to 164 does not use any extended code and is to use the certain orthogonal sign indicating number, and as what will describe after a while is not to carry out integration/division processing in all cases in symbol time, and described a plurality of correlator 149 uses any extended code to carry out the de-spread processing, the execution integral processing is also carried out and is used for the processing of integral result divided by this symbol time in symbol time.

Promptly, to received signal (3) or composite signal (4) and the special code of correlator 161 to 164 inputs as the multiplex signal chip, correlator 161 to 164 is carried out relevant treatment down in corresponding condition (any one among N, T1 and the T2 will be described this after a while).Above-mentioned special code is by the special code in orthogonal code (Walsh sign indicating number) sequence of extended code generation unit 127 generations.This special code (certain orthogonal sign indicating number) can be any sign indicating number, as long as this yard satisfies the following condition that will describe, but all correlators 161 to 164 all use identical sign indicating number.

The condition that is regarded as the sign indicating number of described special code is such sign indicating number: it presses the repetition in the cycle of N/2 for same sign indicating number.Below by concrete example this is described.

Below provided the example of the Walsh matrix (N=8) that uses by extended code generation unit 127.

$W_8=\left[\begin{array}{cccccccc}1& 1& 1& 1& 1& 1& 1& 1\\ 1& 1& 1& 1& -1& -1& -1& -1\\ 1& 1& -1& -1& -1& -1& 1& 1\\ 1& 1& -1& -1& 1& 1& -1& -1\\ 1& -1& -1& 1& 1& -1& -1& 1\\ 1& -1& -1& 1& -1& 1& 1& -1\\ 1& -1& 1& -1& -1& 1& -1& 1\\ 1& -1& 1& -1& 1& -1& 1& -1\end{array}\right]---\left(3\right)$

Below 4 sign indicating numbers corresponding to the circulation in the cycle of press N/2 as same sign indicating number in a plurality of sign indicating numbers in the example of above Walsh matrix yard.

$W_8^0=\left[\begin{array}{cccccccc}1& 1& 1& 1& 1& 1& 1& 1\end{array}\right]$

$W_8^3=\left[\begin{array}{cccccccc}1& 1& -1& -1& 1& 1& -1& -1\end{array}\right]$

$W_8^4=\left[\begin{array}{cccccccc}1& -1& -1& 1& 1& -1& -1& 1\end{array}\right]---\left(4\right)$

$W_8^7=\left[\begin{array}{cccccccc}1& -1& -1& 1& 1& -1& -1& 1\end{array}\right]$

As implied above, for example, sign indicating number [1 1-1-1,1 1-1-1] is the repetition that " 1 1-1-1 " presses the cycle of N/2.

Therefore, in this example,, select any one (can use any one, but all correlators 161 to 164 must use same sign indicating number sequence) in above 4 sign indicating numbers as the sign indicating number sequence that inputs to correlator 161 to 164.By hypothesis with sign indicating number [1 111111 1] input to all correlators 161 to 164 then these correlators between this sign indicating number [1 111111 1] and the signal (received signal (3) or composite signal (4)) imported, carry out relevant treatment, provide following description with concrete example.In the case, much less, in the N that will describe an after a while sampled signal, N equals 8.

Based on above description, in present technique, be to use such as the orthogonal code of Walsh sign indicating number etc. and carry out extension process in the prerequisite of sender side.

To correlator 161 input received signals (3), correlator 161 is carried out relevant treatment in the second sub-symbols time T 2, and to correlator 163 input received signals (3), correlator 163 is carried out relevant treatment in symbol time N.In addition, to correlator 162 input composite signals (4), correlator 162 is carried out relevant treatment in symbol time N, and to correlator 164 input composite signals (4), this correlator 164 is carried out relevant treatment in the first sub-symbols time T 1.

In fact, received signal (3) and composite signal (4) are parallel signals, and each signal (being called as sampling) of the T shown in Figure 15 A (0), T (N/2), T these parallel signals of expression such as (N-1).Parallel signal such as received signal (3) and composite signal (4) is made of to T (N-1) N sampling T (0) respectively.Therefore, for example, " input received signal (3) is to carry out relevant treatment in the second sub-symbols time T 2 " is meant that the sampling T (0) that only imports received signal (3) arrives T (N-1) to carry out relevant treatment to the sampling T (N/2) among the T (N-1).Because N equals 8 in the above example that provides, therefore only input sampling T (4) to T (7) with execution relevant treatment (seeing Figure 15 B).Similarly, " in symbol time N, carry out relevant treatment " and be meant that all sampling T (0) of input arrive T (7) to carry out relevant treatment.In addition, " in the first sub-symbols time T 1, carry out relevant treatment " and be meant that only input sampling T (0) arrives T (3) to carry out relevant treatment.

To its correlator 165 of having imported the output of correlator 161 and 162 degree of correlation between the output of these two correlators is detected.To its correlator 166 of having imported the output of correlator 163 and 164 degree of correlation between the output of these two correlators is detected.If two output valves are identical, then correlator 165 and 166 outputs " 1 " perhaps, if two input values are inequality, are then exported the value (less than 1) according to the difference of two input values.If the difference of two input values is little, then output approaches the value of " 1 ", and perhaps, if the difference of two input values is big, then output approaches the value of " 0 ".

Compare between these two outputs to its comparing unit 167 of having imported the output of correlator 165 and 166.

Figure 15 B and 15C show the content when (when not disperseing) received signal (3) when sender side is not carried out dispersion treatment and composite signal (4).

In the case, if carry out relevant treatment by correlator 163 in symbol time N, then intersymbol interference can not appear.Perhaps, if (by correlator 164) carries out relevant treatment in the first sub-symbols time T 1, then intersymbol interference can not appear.As mentioned above, the result by correlator 163 and 164 relevant treatment of carrying out is not applied intersymbol interference, therefore the correlation from correlator 166 outputs becomes 1.

Simultaneously, all applied intersymbol interference to the result of the relevant treatment in the second sub-symbols time T 2, carried out at received signal (3) (by correlator 161) with at the result of the relevant treatment of composite signal (4) (by correlator 162) in symbol time N.Therefore, the correlation from correlator 165 outputs can not become 1.

Figure 15 D and 15E show the content when (when disperseing) received signal (3) and composite signal (4) when sender side is carried out dispersion treatment.

In the case, owing to intersymbol interference can not occur in by correlator 162 and 161 relevant treatment of carrying out, therefore the correlation from correlator 165 outputs becomes 1.Simultaneously, owing to intersymbol interference can occur in by correlator 163 and 164 relevant treatment of carrying out, therefore the correlation from correlator 166 outputs can not become 1.

If it is bigger than the correlation of exporting from correlator 165 from the correlation of correlator 166 outputs, then comparing unit 167 is not carried out the signal that disperses to selected cell 146 output expressions, perhaps, if last value is bigger than back one value, then carried out the signal that disperses to selected cell 146 output expressions.

Below verify that by above-mentioned concrete example the output (correlation) of correlator 165/166 becomes the reason of 1 (or not becoming 1).Here, because data are " 1 ", therefore the output of autocorrelator becomes " 1 " when not applying interference.

Suppose at first, as described above to all correlators 161 to 164 input codes [1 111111 1].As verification method, for in the correlator 161 to 164 each, the signal (C0, C1, C2) that will constitute input signal (received signal (3) or composite signal (4)) multiplies each other with sign indicating number [1 111111 1], try to achieve their summation and with this summation divided by the quantity of input sampling (only at the example of this yard sequence, can think with by signal (C0, C1, C2) being carried out the quantity that result that integration obtains samples divided by input).For correlator 161 and 164, the quantity of input sampling is 4, is 8 for correlator 162 and 163.

Employing is not carried out the situation of dispersion treatment as example in sender side shown in Figure 15 B and 15C, by will becoming 8 to the multiply each other result's that obtains summation of C0 and sign indicating number [1 111111 1], and the result's who obtains by being multiplied each other in C1 and C2 and yard [1 111111 1] respectively in correlator 163 summation becomes 0.Therefore, summation is 8, and has obtained 1 by the quantity (=8) that this summation is sampled divided by input.Simultaneously, in correlator 164, the first half (T (0) is to T (3)) of corresponding signal (C0, C1, C2) and the latter half [1 11 1] of sign indicating number are multiplied each other.The summation of C0 and C2 all becomes 0, and the summation of C1 becomes 4 thus.Therefore, summation is 4, and has obtained 1 by the quantity (=4) that this summation 4 is sampled divided by input.Therefore, the input of correlator 166 is all become 1, thereby correlator 166 output correlations 1.

Simultaneously, in correlator 161, the summation of C0, C1 and C2 becomes 4 ,-4 and 0 respectively, and adds up to 0.Therefore, the result of division becomes 0.In correlator 162, the summation of C0, C1 and C2 becomes 4,4 and 0 respectively, adds up to 8.Therefore, the result of division becomes 1.Therefore, in the case, the input of correlator 165 is all become 0 and 1, thereby correlation can not become 1 (becoming than 1 little value).

Therefore, in the case, as mentioned above, big than the correlation of exporting from correlator 165 from the correlation of correlator 166 outputs.If also similarly verify at Figure 15 D and 15E, then their result becomes identical with above description, although this is not specifically described.Equally, for DFT unit in the above-mentioned example of OFDM 111 to 114 and correlator 115 and 116 (Figure 12 etc.), if similarly verify, then their result becomes identical with foregoing description.

In above-mentioned example, the phenomenon of " intersymbol interference can not occur " is meant the summation of the signal except that signal (C0) corresponding to input code [1 111111 1], that is, the summation of each among C1 and the C2 all becomes 0.

So far, illustrate and described the structure when first basic structure is applied to OFDM or CDMA and the example of operation.Yet, not shown and describe the structure when second basic structure is applied to OFDM or CDMA and the example of operation.Basically, only by by with Fig. 5 in the similar mode of mode add to disperse expression signal generating unit 52 and disperse the multiplexed unit 51 of expression signal to the structure shown in Fig. 9,10 and 13, and only, can realize second basic structure by disperseing expression detecting signal unit 71 by adding to the structure shown in Figure 11 and 14 with the similar mode of mode shown in Figure 7.Even second basic structure is applied to OFDM or CDMA, only use the structure shown in Fig. 6 A and the 8A just to enable this realization.

Here, can determine that whether received signal is dispersed to the method for the signal of a plurality of sub-symbols for its transmitted power, it is also conceivable that the whole bag of tricks except the method for having described at first and second basic structures at receiver-side as being used for making.Followingly an example in this method is described as another preferred embodiment.

At first another preferred embodiment (numbering 1) is described.

Figure 16 shows the example of the structure of the transmitter in another preferred embodiment of OFDM modulator approach.

Transmitter 170 shown in this figure comprises string and converting unit 301, mapping circuit 302, power dispersal unit 172, transmitted power peak detection unit 173, selected cell 174, parallel serial conversion unit 175, all kinds timing signal generating unit 176 and IFFT unit 177.Basically, those functions of the string in the operation of these component parts and the transmitter 90 shown in Figure 10 and converting unit 301, mapping circuit 302, transmitted power dispersal unit 92, transmitted power peak detection unit 93, selected cell 94, parallel serial conversion unit 95, all kinds timing signal generating unit 96 and IFFT unit 303 are almost similar.Yet difference is also to disperse detection signal (first and second disperse detection signal) externally to input to IFFT unit 177 with two.

Therefore, not only disperse detection signal to the output of IFFT (invert fast fourier transformation) unit 177 input mapping circuits 302 but also to its input first and second, IFFT unit 177 is transformed into time domain with the frequency domain of these input signals.Here, suppose in the following description first and second the dispersion detection signals after disperseing detection signals to be illustrated in to have been undertaken handling by IFFT (invert fast fourier transformation) unit 177.

For example, disperse detection signal to be inserted in the protection frequency band of ofdm modulation signal as shown in figure 17 with these two.If use above-mentioned f0 (=0Hz) as benchmark, as shown in figure 17, then these two are disperseed detection signals for example to become the signal of frequency for " f0-Δ f " and " f0+ Δ f " (Δ f can be set at suitable value).Therefore, these two are disperseed detection signal to have for example relation shown in Figure 19 B.Note, make these two to disperse detection signal to become above-mentioned even number subcarrier.These two are disperseed the example in the protection frequency band that detection signal is not limited to be inserted in ofdm modulation signal.For example, can distribute two untapped subcarriers to two dispersion detection signals, to generate ofdm modulation signal.

Figure 18 is the block diagram that illustrates with the structure of transmitter shown in Figure 16 170 corresponding receivers.

Receiver 180 shown in this figure comprises string and converting unit 181, symbol timing detecting unit 182, all kinds timing signal generating unit 183, power combiner 184, disperses detection signal detecting unit 185, selected cell 186, FFT unit 188 and parallel serial conversion unit 187.

In these component parts, the component part except that disperseing detection signal detecting unit 185 is identical with those component parts shown in Figure 11.Therefore, omit description of them.In structure shown in Figure 180, be provided with and disperse detection signal detecting unit 185 to substitute dispersion detecting unit 105 shown in Figure 11.

As shown in figure 18, to disperseing 185 inputs of detection signal detecting unit to receive data, disperse detection signal detecting unit 185 to carry out/do not carried out the signal that disperses to selected cell 186 output expressions.The output of string and converting unit 181 can be inputed to and disperse detection signal detecting unit 185.

Followingly the dispersion detection signal detecting unit 185 that receiver 180 comprises is described with reference to Figure 19.

Shown in Figure 19 A, disperse detection signal detecting unit 185 to comprise DFT unit 191,192,193 and 194, correlator 195 and 196 and comparing unit 197.The function of these component parts can with the DFT unit 111 to 114 shown in Figure 12 A, correlator 115 and 116 and those function classes of comparing unit 117 seemingly.Yet for DFT unit 111 to 114 (191 to 194), their input data are different with processing target.

That is, input received signal of the DFT unit in the structure shown in Figure 12 A or composite signal.Simultaneously, to all DFT unit 191 to the 194 input received signals shown in Figure 19 A.In addition, the DFT unit in the structure shown in Figure 12 A is that target is carried out the DFT processing with same even number subcarrier.Yet in the structure shown in Figure 19 A, it is that target is carried out the DFT processing that DFT unit 191 and 193 disperses detection signal with first, and DFT unit 192 and 194 is that target execution DFT handles with the second dispersion detection signal.In addition, DFT unit 191 and 192 is carried out DFT and is handled in the second sub-symbols time T 2, and the DFT processing is carried out in DFT unit 193 and 194 in OFDM symbol time N.

Above explanation is summarized as follows.

DFT unit 191 disperses detection signal to carry out the DFT processing in the second sub-symbols time T 2 at first of received signal.

DFT unit 192 disperses detection signal to carry out the DFT processing in the second sub-symbols time T 2 at second of received signal.

DFT unit 193 disperses detection signal to carry out the DFT processing in symbol time N at first of received signal.

DFT unit 194 disperses detection signal to carry out the DFT processing in symbol time N at second of received signal.

Correlator 195 obtains the degree of correlation between the output signal of DFT unit 191 and 192.Correlator 196 obtains the degree of correlation between the output signal of DFT unit 193 and 194.To the output of comparing unit 197 input correlators 195 and 196, comparing unit 197 compares these two outputs.If the output valve of correlator 195 is bigger, then comparing unit 197 has been carried out the signal that disperses to selected cell 186 output expressions, perhaps, if the output valve of correlator 196 is bigger, then comparing unit 197 is not carried out the signal that disperses to selected cell 186 output expressions.

Carried out the signal that disperses if received signal is expression, then the DFT in the second sub-symbols time T 2 can not occur disturbing between subcarrier in handling.Therefore, the degree of correlation between the output of DFT unit 191 and 192 becomes 1.Simultaneously, the DFT in symbol time N can occur disturbing between subcarrier in handling.Therefore, the degree of correlation between the output of DFT unit 193 and 194 can not become 1.

Similarly, if received signal is to represent not carry out the signal of dispersion, then the degree of correlation between the output of DFT unit 191 and 192 can not become 1, but the degree of correlation between the output of DFT unit 193 and 194 can become 1.

Therefore, these relevance degrees are compared, can detect thus and whether carry out dispersion.

Figure 19 B and 19C only show first and second and disperse detection signal.Yet, naturally a plurality of subcarriers are multiplexed into received signal.Much less, the frequency of these subcarriers becomes and the first and second different frequencies of frequency of disperseing detection signal.In the example of the signal shown in Figure 19 B and the 19C, if can not occur disturbing between subcarrier, then DFT unit 191 to 194 outputs " 1 ".

The block diagram of the transmitter in Figure 20 has been an illustration another preferred embodiment of CDM modulator approach.

Transmitter 200 shown in this figure comprises string and converting unit 201, transmitted power dispersal unit 202, transmitted power peak detection unit 203, selected cell 204, parallel serial conversion unit 205, all kinds timing signal generating unit 206, extended code generation unit 207, expander 208, synthesizer 209 and string and converting unit 210.

The structure of said structure and transmitter 120 shown in Figure 13 much at one.Yet, difference is not only to disperse detection signal (first and second disperse detection signal) to the output signal of expander 208 input strings and converting unit 201 but also to described two of expander 208 inputs, and expander 208 is also by using the not use extended code in a plurality of extended codes that generated by extended code generation unit 207 to disperse detection signal to carry out extension process to these two.

The condition of this preferred embodiment is to make first and second disperse the value of detection signal identical.Owing on a code element, the one digit number certificate is set, therefore makes first and second disperse the value of detection signal all to become " 0 " or " 1 " for each code element.

Here, suppose that also expander 208 disperses detection signal to carry out extension process by using sign indicating number [1 111111 1] at first, and by using sign indicating number [1 1-1-1,1 1-1-1] to disperse detection signal to carry out extension process at second, and, shown in Figure 22 B, make first detection signal (a) and second detection signal (b) that obtain according to extension process become [1 111111 1] and [1 1-1-1,1 1-1-1] own (for realizing this situation, default first and second disperse the values of detection signals).Being used for first and second disperses the extended code of detection signal to be not limited to the above example that provides.Yet must use such sign indicating number: it is the repetition that same sign indicating number is pressed the cycle of N/2.

Figure 21 is the block diagram that illustrates with the structure of above-mentioned transmitter 200 corresponding receivers 220.

Receiver 220 shown in this figure comprises string and converting unit 221, symbol timing detecting unit 222, all kinds timing signal generating unit 223, power combiner 224, disperses detection signal detecting unit 225, selected cell 226, parallel serial conversion unit 228, correlator 229, extended code generation unit 230 and parallel serial conversion unit 227.

Difference between receiver 220 shown in Figure 21 and the receiver 140 shown in Figure 14 is: the dispersion detecting unit 145 that disperses detection signal detecting unit 225 to replace in the receiver 140 is set.In the example shown in this figure, be constant to disperseing 225 inputs of detection signal detecting unit to receive data.But, can input string and the output of converting unit 221.

Figure 22 A shows the example of disperseing detection signal detecting unit 225.

Dispersion detection signal detecting unit 225 shown in this figure comprises correlator 241,242,243,244,245 and 246 and comparing unit 247.Those function classes of the function of these component parts and the corresponding component part shown in Figure 15 A seemingly.Yet for correlator 241 to 244, their input data and processing target are different.

That is, in the structure shown in Figure 15 A, import received signal or composite signals to correlator 161 to 164.Yet, to all correlator 241 to the 244 input received signals shown in Figure 22 A.In addition, the correlator shown in Figure 15 A 161 to 164 is carried out relevant treatment (still, using identical sign indicating number in all correlators) by using as same sign indicating number by in a plurality of sign indicating numbers of the repetition in the cycle of N/2 any one.Simultaneously, the correlator shown in Figure 22 A 241 to 244 is carried out relevant treatment by use and any the corresponding sign indicating number in first and second detection signals.Promptly, correlator 241 and 243 is used to first sign indicating number (aforesaid [1 111111 1]) that disperses detection signal to expand is carried out relevant treatment by use, and correlator 242 and 244 is used to second sign indicating number (aforesaid [1 1-1-1,1 1-1-1]) that disperses detection signal to expand is carried out relevant treatment by use.

In addition, correlator 241 and 242 is carried out relevant treatment in the second sub-symbols time T 2, and correlator 243 and 244 is carried out relevant treatment in symbol time N.

To being summarized as follows of above explanation.

Correlator 241 is carried out relevant treatment at first detection signal of received signal in the second sub-symbols time T 2.

Correlator 242 is carried out relevant treatment at second detection signal of received signal in the second sub-symbols time T 2.

Correlator 243 is carried out relevant treatment at first detection signal of received signal in symbol time N.

Correlator 244 is carried out relevant treatment at second detection signal of received signal in symbol time N.

To the output of correlator 245 input correlators 241 and 242, correlator 245 obtains correlation, and the value that is obtained is exported to comparing unit 247.To the output of correlator 246 input correlators 243 and 244, correlator 246 obtains correlation, and the value that is obtained is exported to comparing unit 247.Comparing unit 247 compares the output valve of correlator 245 and 246.If the output of correlator 246 is bigger, then comparing unit 247 is not carried out the signal that disperses to selected cell 226 output expressions, and perhaps, if the output of correlator 245 is bigger, then comparing unit 247 has been carried out the signal that disperses to selected cell 226 output expressions.

In Figure 22 B and 22C, only show to its multiplexed comprise in the received signal of various types of signals first and second disperse detection signals.Yet, have other signals naturally.Therefore, in intersymbol interference, comprise intersymbol interference with other signals.

First and second detection signals when not carrying out dispersion have been shown in Figure 22 B.Much less, these signals become first detection signal (a) and second detection signal of describing with reference to Figure 20 (b) itself.Simultaneously, first and second detection signals when having carried out dispersion shown in Figure 22 C become first detection signal (a) and second detection signal (b) that wherein first sub-symbols as shown in the drawing is in the state that does not have signal.

Therefore, because (and first and second disperses the value of detection signal identical as mentioned above) intersymbol interference can not occur in the relevant treatment by correlator 241 and 242 execution when having carried out dispersion in this example, therefore correlator 241 becomes identical (as " 1 ") with 242 output, and much less the output of correlator 245 becomes " 1 ".Simultaneously, in by correlator 243 and 244 relevant treatment of carrying out intersymbol interference can appear when having carried out when disperseing.Therefore, the output of correlator 246 can not become " 1 " (becoming than 1 little value).Therefore, the signal that disperses has been carried out in comparing unit 247 output expressions.

Similarly, when not carrying out dispersion, the output of correlator 245 can not become " 1 " (becoming than 1 little value), and the output of correlator 246 becomes " 1 ".Therefore, the signal that disperses is not carried out in comparing unit 247 output expressions.

Figure 23 A shows the example of another structure of disperseing expression signal generating unit 52.

Fig. 6 A has shown the example of the structure of disperseing expression signal generating unit 52.Yet this structure is not limited to this example, and for example can be the structure shown in Figure 23 A etc.

Whether Figure 23 A shows wherein and will carry out disperseing to transmitted power and be generated as the example of ASK signal.

The signal of oscillator 251 output preset frequencies.In this example, generate and export half the signal that its cycle is a Baud Length.

Come the on/off of control switch 252 by detection signal b.That is, connect switch 252 when detection signal b is " 0 ", cut-off switch 252 when detection signal b is " 1 ".With reference to Fig. 6 etc. detection signal b is described.

By the operation of switch 252, shown in Figure 23 C, (when not carrying out dispersion) disperses expression signal to become the output signal of oscillator 251 when detection signal b is " 0 ".Simultaneously, shown in Figure 23 D, (when having carried out dispersion) disperses the expression signal to become the state that does not have signal when detection signal b is " 1 ".

As described in reference Fig. 5, it is multiplexed that this dispersion is represented that signal carries out.Whether therefore, can send signal to expression under the situation that does not produce interference is that the dispersion that is dispersed to the signal of a plurality of sub-symbols represents that signal carries out multiplexed and transmission.

Figure 24 A shows the example of disperseing the structure of expression detecting signal unit 71 when disperseing expression signal generating unit 52 to have structure shown in Figure 23 A.That is, this is the example of another structure except that the structure shown in Fig. 8 A.

Dispersion in the example shown in Figure 24 A represents that detecting signal unit 71 comprises dispersion expression signal extraction unit 261, detector 262, discriminator 263 and timing signal generating unit 264.

Timing signal generating unit 264 is to discriminator 263 output input symbols timing signals.Discriminator 263 will compare from the signal and the predetermined threshold value level of detector 262 outputs each code element based on this symbol timing signal pin.If surpass this threshold level from the signal of detector 262 outputs, then the signal that disperses is not carried out in discriminator 263 output expressions, and perhaps, if described signal is no more than this threshold level, then the signal that disperses has been carried out in the output expression.

Specifically, disperseing expression signal extraction unit 261 is the filters that only make that the characteristic frequency district passes through.Naturally, only make the output signal frequency of oscillator 251 pass through.Therefore, when not carrying out dispersion, disperse expression signal extraction unit 261 to extract the dispersion shown in Figure 23 C that is included in the received signal and represent signal, can not extract any signal and when having carried out dispersion, (exported no signal).Because the dispersion when having carried out dispersion represents that signal is the no signal shown in Figure 23 D, therefore can think that having extracted the dispersion shown in Figure 23 D represents signal (spacing wave).

Therefore, shown in Figure 24 B, when not carrying out dispersion, become the signal that its level is equal to or higher than predetermined level by the signal after detector 262 detections, and when having carried out dispersion, become near 0 level.Therefore, if, then can detect and whether carry out dispersion by the comparison of discriminator 263 execution with threshold level.

By according to of the present invention communication system and transmitter, receiver etc., can under the situation that does not make the bit error rate deterioration, reduce PAPR.Therefore, power consumption can be reduced, and miniaturization can be realized.

Claims (17)

1. communication system with transmitter and receiver, wherein:

Described transmitter comprises:

The transmitted power peak detection unit is used for each code element at multiplexed transmission sampling or transmission chip, each transmitted power in the code element is measured, and whether measured value is detected above predetermined threshold value; With

The power dispersal unit is used for by each transmitted power in the described code element being distributed to by described code element being cut apart a plurality of sub-symbols that constitute generate decentralized signal and with its output, and

Surpass described predetermined threshold value if described transmitted power peak detection unit detects the described value that measures, the described decentralized signal that then described transmitter is exported from described power dispersal unit by use carries out the transmission to described receiver; And

Described receiver comprises:

Power combiner, whether itself and received signal are that the signal that is distributed to a plurality of sub-symbols has nothing to do, and a plurality of sampled signals are synthesized, and composite signal is outputed to selected cell and disperses detecting unit;

Whether disperse detecting unit, be used for when receiving from signal that described transmitter sends, be that described decentralized signal detects at each code element of described received signal to described received signal; With

Selected cell, it is according to select and export in the composite signal of described received signal and described power combiner any from the detection signal of described dispersion detecting unit;

Wherein, described received signal is the signal of described decentralized signal if described detection signal is expression, and described composite signal is selected and exported to then described selected cell;

Wherein, described power dispersal unit comprises:

A plurality of adders are used at each of a plurality of sampled signals exporting described a plurality of sampled signal sum;

A plurality of subtracters are used to export the poor of described a plurality of sampled signal; And

A plurality of attenuators are used for making each the power attenuation of output signal in each and the described a plurality of subtracters of described a plurality of adders, and

Make described a plurality of attenuator corresponding in described a plurality of sub-symbols each,

Wherein, described power combiner comprises:

A plurality of adders, be used at a plurality of acceptance sampling signals in the described code element of described received signal each to export described a plurality of acceptance sampling signal sum and

A plurality of subtracters are used to obtain the poor of described a plurality of acceptance sampling signals; And

Make in each and the described a plurality of subtracters in described a plurality of adder each corresponding in described a plurality of sub-symbols each.

2. transmitter, this transmitter comprises:

The transmitted power peak detection unit is used for each code element at multiplexed transmission sampling or transmission chip, each transmitted power in the code element is measured, and whether measured value is detected above predetermined threshold value; With

The power dispersal unit is used for by each transmitted power in the described code element being distributed to by described code element being cut apart a plurality of sub-symbols that constitute generate decentralized signal and with its output, and

Surpass described predetermined threshold value if described transmitted power peak detection unit detects the described value that measures, then described transmitter sends signal by using from the described decentralized signal of described power dispersal unit output is next to any receiver output,

Wherein, described power dispersal unit comprises:

A plurality of adders are used at each of a plurality of sampled signals exporting described a plurality of sampled signal sum;

A plurality of subtracters are used to export the poor of described a plurality of sampled signal; And

A plurality of attenuators are used for making each the power attenuation of output signal in each and the described a plurality of subtracters of described a plurality of adders, and

Make described a plurality of attenuator corresponding in described a plurality of sub-symbols each.

3. receiver, this receiver comprises:

Power combiner, whether itself and received signal are that the signal that is distributed to a plurality of sub-symbols has nothing to do, and a plurality of sampled signals are synthesized, and composite signal is outputed to selected cell and disperses detecting unit;

Disperse detecting unit, be used for when receiving from signal that any transmitter sends, each code element at described received signal, whether to described received signal is that decentralized signal detects, and described decentralized signal is to generate by each transmitted power in the code element is distributed to by described code element is cut apart a plurality of sub-symbols that constituted; With

Selected cell, it is according to selecting and export in the composite signal of described received signal and described power combiner any from the detection signal of described dispersion detecting unit,

Wherein, described received signal is the signal of described decentralized signal if described detection signal is expression, and described composite signal is selected and exported to then described selected cell,

Wherein, described power combiner comprises:

A plurality of adders, be used at a plurality of acceptance sampling signals in the described code element of described received signal each to export described a plurality of acceptance sampling signal sum and

A plurality of subtracters are used to obtain the poor of described a plurality of acceptance sampling signals; And

Make in each and the described a plurality of subtracters in described a plurality of adder each corresponding in described a plurality of sub-symbols each.

4. transmitter according to claim 2, this transmitter also comprises:

Disperse the expression signal generating unit, be used for detecting the described value that measures at described transmitted power peak detection unit and surpass under the situation of described threshold value, the transmitted power in the described code element of generation expression is dispersed to the dispersion of described a plurality of sub-symbols and represents signal; With

Disperse the multiplexed unit of expression signal, be used for described dispersion is represented that signal is multiplexed to described transmission signal.

5. receiver according to claim 3, this receiver also comprises:

Detecting signal unit is represented in dispersion as the substitute of described dispersion detecting unit, be used for extracting the dispersion of having represented whether to have carried out the power dispersion and represent signal, and represent that based on described dispersion signal detects the dispersion of whether having carried out transmitted power from described received signal.

6. transmitter according to claim 2, under the situation of using the Orthodoxy Frequency Division Multiplex modulator approach to communicate, this transmitter also comprises:

The multiplexed unit of decentralized signal is used for by using two to disperse detection signal to add two dispersion detection subcarriers to the frequency band of protection frequency band or untapped subcarrier.

7. receiver according to claim 3; under the situation of using the Orthodoxy Frequency Division Multiplex modulator approach to communicate; if described received signal is wherein to have added a plurality of dispersions to the frequency band of protecting frequency band or untapped subcarrier to detect subcarrier signals; then as the substitute of described dispersion detecting unit, this receiver also comprises:

Disperse the detection signal detecting unit, be used for detecting the dispersion of whether having carried out described transmitted power by using described a plurality of dispersion to detect subcarrier.

8. transmitter according to claim 2, under the situation of using the code division multiplex modulator approach to communicate, this transmitter also comprises:

Expanding element is used for by using untapped extended code to disperse detection signal to carry out extension process to two.

9. receiver according to claim 3, under the situation of using the code division multiplex modulator approach to communicate, if described received signal comprises by using untapped extended code to two a plurality of detection signals that disperse detection signal to expand to generate, then as the substitute of described dispersion detecting unit, this receiver also comprises:

Disperse the detection signal detecting unit, be used for by using the detection signal that is generated to detect the dispersion of whether having carried out described transmitted power.

10. one kind is used for the communication means that uses in the communication system with transmitter and receiver, and this communication means may further comprise the steps:

In described sender side, use the transmitted power peak detection unit, at each code element of multiplexed transmission sampling or transmission chip, each transmitted power in the code element is measured, and whether measured value is detected above predetermined threshold value; Use the power dispersal unit, by each transmitted power in the described code element being distributed to by described code element being cut apart a plurality of sub-symbols that constitute generate decentralized signal and with its output; And if described transmitted power peak detection unit detects the described value that measures and surpass described predetermined threshold value, then described transmitter carries out transmission to described receiver by using from the described decentralized signal of described power dispersal unit output; With

At described receiver-side, use power combiner, with received signal whether be that to be distributed to the signal of a plurality of sub-symbols irrelevant, a plurality of sampled signals are synthesized, and composite signal are outputed to selected cell and disperses detecting unit; Whether use to disperse detecting unit, when receiving from signal that described transmitter sends, be that described decentralized signal detects at each code element of described received signal to described received signal; With use selected cell, according to selecting and export in the composite signal of described received signal and described power combiner any from the detection signal of described dispersion detecting unit,

Wherein, described received signal is the signal of described decentralized signal if described detection signal is expression, and described composite signal is selected and exported to then described selected cell,

Wherein, described power dispersal unit comprises:

A plurality of adders are used at each of a plurality of sampled signals exporting described a plurality of sampled signal sum;

A plurality of subtracters are used to export the poor of described a plurality of sampled signal; And

A plurality of attenuators are used for making each the power attenuation of output signal in each and the described a plurality of subtracters of described a plurality of adders, and

Make described a plurality of attenuator corresponding in described a plurality of sub-symbols each,

Wherein, described power combiner comprises:

A plurality of adders, be used at a plurality of acceptance sampling signals in the described code element of described received signal each to export described a plurality of acceptance sampling signal sum and

A plurality of subtracters are used to obtain the poor of described a plurality of acceptance sampling signals; And

Make in each and the described a plurality of subtracters in described a plurality of adder each corresponding in described a plurality of sub-symbols each.

11. the communication system with transmitter and receiver, wherein:

Described transmitter comprises:

The transmitted power peak detection unit, to a plurality of sampled signals of described transmitted power peak detection unit input as a plurality of parallel signals of a code element of multiplexed transmission sampling or transmission chip, described transmitted power peak detection unit is measured each the instantaneous transmitted power in described a plurality of sampled signals, and detects any one or more a plurality of predetermined threshold value that whether surpasses in measured a plurality of values;

The power dispersal unit, import described a plurality of sampled signal to described power dispersal unit, described power dispersal unit generates a plurality of decentralized signals and exports these decentralized signals by each the transmitted power in described a plurality of sampled signals is distributed to by described code element being cut apart a plurality of sub-symbols that constitute, and

Selected cell, import described a plurality of sampled signal and described a plurality of decentralized signal to described selected cell, any in described a plurality of sampled signal and the described a plurality of decentralized signal selected and exported to described selected cell according to the testing result of described transmitted power peak detection unit, and

Described transmitter comes described receiver is sent by the output of using described selected cell; And

Described receiver comprises:

Power combiner, whether itself and received signal are that the signal that is distributed to a plurality of sub-symbols has nothing to do, and a plurality of sampled signals are synthesized, and composite signal is outputed to selected cell and disperses detecting unit;

Whether disperse detecting unit, be used for when receiving from signal that described transmitter sends, be that described decentralized signal detects at each code element of described received signal to described received signal; With

Selected cell, it is according to selecting and export in the composite signal of described received signal and described power combiner any from the detection signal of described dispersion detecting unit,

Wherein, described received signal is the signal of described decentralized signal if described detection signal is expression, and described composite signal is selected and exported to then described selected cell,

Wherein, described power dispersal unit comprises:

A plurality of adders are used at each of a plurality of sampled signals exporting described a plurality of sampled signal sum;

A plurality of subtracters are used to export the poor of described a plurality of sampled signal; And

A plurality of attenuators are used for making each the power attenuation of output signal in each and the described a plurality of subtracters of described a plurality of adders, and

Make described a plurality of attenuator corresponding in described a plurality of sub-symbols each,

Wherein, described power combiner comprises:

A plurality of adders, be used at a plurality of acceptance sampling signals in the described code element of described received signal each to export described a plurality of acceptance sampling signal sum and

A plurality of subtracters are used to obtain the poor of described a plurality of acceptance sampling signals; And

Make in each and the described a plurality of subtracters in described a plurality of adder each corresponding in described a plurality of sub-symbols each.

12. a transmitter, this transmitter comprises:

The transmitted power peak detection unit, to a plurality of sampled signals of described transmitted power peak detection unit input as a plurality of parallel signals of a code element of multiplexed transmission sampling or transmission chip, described transmitted power peak detection unit is used for the instantaneous transmitted power of each of described a plurality of sampled signals is measured, and detects any one or more a plurality of predetermined threshold value that whether surpasses in measured a plurality of values;

The power dispersal unit, import described a plurality of sampled signal to described power dispersal unit, described power dispersal unit is used for being distributed to by a described code element is cut apart a plurality of sub-symbols that constitute by each the transmitted power with described a plurality of sampled signals and generates a plurality of decentralized signals and export these decentralized signals, and

Selected cell, import described a plurality of sampled signal and described a plurality of decentralized signal to described selected cell, described selected cell is used for selecting and exporting according to the testing result of described transmitted power peak detection unit any of described a plurality of sampled signal and described a plurality of decentralized signals, and

Described transmitter will send signal by the output of using described selected cell and send to any receiver,

Wherein, described power dispersal unit comprises:

A plurality of adders are used at each of a plurality of sampled signals exporting described a plurality of sampled signal sum;

A plurality of subtracters are used to export the poor of described a plurality of sampled signal; And

A plurality of attenuators are used for making each the power attenuation of output signal in each and the described a plurality of subtracters of described a plurality of adders, and

Make described a plurality of attenuator corresponding in described a plurality of sub-symbols each.

13. a receiver, this receiver comprises:

Power combiner, whether itself and received signal are that the signal that is distributed to a plurality of sub-symbols has nothing to do, and a plurality of sampled signals are synthesized, and composite signal is outputed to selected cell and disperses detecting unit;

Disperse detecting unit, be used for when receiving from signal that transmitter sends, whether each code element at described received signal is that decentralized signal detects to described received signal, and described decentralized signal is to generate by each transmitted power in the code element is distributed to by described code element is cut apart a plurality of sub-symbols that constituted; With

Selected cell, it is according to selecting and export in the composite signal of described received signal and described power combiner any from the detection signal of described dispersion detecting unit,

Wherein, described received signal is the signal of described decentralized signal if described detection signal is expression, and described composite signal is selected and exported to then described selected cell,

Wherein, described power combiner comprises:

A plurality of adders, be used at a plurality of acceptance sampling signals in the described code element of described received signal each to export described a plurality of acceptance sampling signal sum and

A plurality of subtracters are used to obtain the poor of described a plurality of acceptance sampling signals; And

Make in each and the described a plurality of subtracters in described a plurality of adder each corresponding in described a plurality of sub-symbols each.

14. receiver according to claim 13, wherein,

Under the situation of the communication of Orthodoxy Frequency Division Multiplex modulator approach,

Described dispersion detecting unit comprises:

A plurality of discrete Fourier transform unit, import the output of described string and converting unit or the output of described synthesis unit to described a plurality of discrete Fourier transform unit, described discrete Fourier transform unit is used for that any even number subcarrier is carried out discrete Fourier transform (DFT) and handles; With

Two correlators are imported the output of the specific a pair of discrete Fourier transform unit in described a plurality of discrete Fourier transform unit to described two correlators, and described correlator is used to obtain the degree of correlation; And

Compare by the output with described two correlators, whether a described code element that detects described received signal is dispersed to described a plurality of sub-symbols.

15. receiver according to claim 13, under the situation of the communication of code division multiplex modulator approach, described receiver also comprises:

As a plurality of correlation units of the substitute of described dispersion detecting unit, import the output of described string and converting unit or the output of described synthesis unit to described a plurality of correlation units, described correlation unit is used for by using the certain orthogonal sign indicating number to carry out relevant treatment; With

Two correlators are imported the output of the specific a pair of correlation unit in described a plurality of correlation unit to described two correlators, and described correlator is used to obtain the degree of correlation, wherein

Compare by the output with described two correlators, whether a described code element that detects described received signal is dispersed to described a plurality of sub-symbols.

16. receiver according to claim 13; under the situation of the communication of Orthodoxy Frequency Division Multiplex modulator approach; if described received signal is wherein to have added a plurality of dispersions detection subcarrier signals to protection frequency band or a plurality of frequency band of subcarrier that do not use; then as the substitute of described dispersion detecting unit, described receiver also comprises:

A plurality of discrete Fourier transform unit, import the output of described string and converting unit to described a plurality of discrete Fourier transform unit, it be that target is carried out the discrete Fourier transform (DFT) processing respectively that described a plurality of discrete Fourier transform unit are used for described two any one of disperseing to detect subcarriers; With

Two correlators are imported the output of the specific a pair of discrete Fourier transform unit in described a plurality of discrete Fourier transform unit to described two correlators, and described correlator is used to obtain the degree of correlation; Wherein

Compare by the output with described two correlators, whether a described code element that detects described received signal is dispersed to described a plurality of sub-symbols.

17. receiver according to claim 13, under the situation of the communication of code division multiplex modulator approach, if described received signal comprises by using untapped extended code to two signals that disperse detection signal to expand to generate, then as the substitute of described dispersion detecting unit, described receiver also comprises:

A plurality of correlation units are imported the output of described string and converting unit to described a plurality of correlation units, and described a plurality of correlation units are used for by using described extended code to carry out relevant treatment respectively; With

Two correlators are imported the output of the specific a pair of correlation unit in described a plurality of correlation unit to described two correlators, and described correlator is used to obtain the degree of correlation, wherein

Compare by the output with described two correlators, whether a described code element that detects described received signal is dispersed to described a plurality of sub-symbols.

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